P1.2: Changes Of State Flashcards
(34 cards)
What is density?
How much mass there is in a certain volume.
What is the difference in density between 2 different sized blocks made of the same material?
Nothing, density is the same for both
What is density a property of?
A material
What is the density formula?
Density (kg/m3) = mass (kg) / volume (m3)
Why would a substance in the solid state be denser than the same substance in a gaseous state?
1cm3 in the solid state have more particles than in 1cm3 of the same substance in a gas
How will the density be affected if there is a larger mass?
Higher density
How will the density be affected if there is a smaller mass?
Lower density
How will the density be affected if there is a larger volume?
Lower density
How will the density be affected if there is a smaller mass?
Lower density
What is the Law of Conservation Of Mass?
Particles do not disappear.
It applies if instances are condensing, melting, boiling etc.
Molecules do not disappear
What is temperature?
Tells you how hot or cold something is
What are the 2 units of temperature?
Celsius
Kelvin
How many celsius is there in 0 Kelvin?
-273 celsius
How many kelvins are there in 0 degrees celsius?
273 kelvin
What happens when you heat up water?
You transfer energy from the chemical store of the fuel to the thermal store of water
The particles of water move faster/vibrate more
The individual particles do NOT get hotter
Temperature tels you about…
The average kinetic energy of the particles
What is the energy in a thermal store measured in?
Joules
What 3 things can heating do?
Change the energy stored within the system to change the temp
Produce a change of state
Make a chemical reactions happen
What does the energy needed to raise the temp depend on?
Type of material
Mass of material
How much temperature needs to rise
What is specific heat capacity?
The energy needed to raise the temp of 1kg of a material by 1k.
What does heating do?
Heating increases the internal energy of the material
SHC formula?
Change in thermal energy (J) = mass (kg) x specific heat capacity (J/kg C) x change in temp (degrees C)
What can SHC tell you?
How resistant a material is to a change in temperature